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arXiv · 2505.05141

Exponential Dependence of Interlayer Exchange Coupling in Fe/MgO(001) Superlattices on Temperature

Nanny Strandqvist·Tobias Warnatz·Kristbjörg Anna Thórarinsdóttir·Alexei Vorobiev·Vassilios Kapaklis·Björgvin Hjörvarsson
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Abstract

The interlayer exchange coupling in Fe/MgO(001) superlattices is found to increase exponentially with decreasing temperature. Around 150~K, the field induced response changes from discrete switching, governed by field-driven domain propagation, to a collective rotation of the magnetic layers. This transition is accompanied by a change in the magnetic ground state from 180$^{\circ}$ (antiferromagnetic) to 90$^{\circ}$ alignment between adjacent Fe layers. These effects are argued to arise from quantum well states, defined by the total thickness of the samples.

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Nanny Strandqvist, Tobias Warnatz, Kristbjörg Anna Thórarinsdóttir, Alexei Vorobiev, Vassilios Kapaklis, Björgvin Hjörvarsson. 2025-05-08. Exponential Dependence of Interlayer Exchange Coupling in Fe/MgO(001) Superlattices on Temperature. https://arxiv.org/abs/2505.05141

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